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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52be20799bb88d55ccf11669127136cf5764f1a7d907b7530f8fea22c755f1d9' 
  AND token = 'GCRcR9WU7g7Kwn0iszkE0eki5X8Ir4r4k7d2miClcpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}