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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14a7765b539d279d43326c1a5dede95698261adaa87c4b8ba888a356b7d32a8' 
  AND token = 'u/okLHImzWgCbwxNgrCNcn854NmF2Jyv0fUdGHOh3sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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