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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdafeedd05cb7bbb9489485145c1e1dee936148ded96f2374616e2e36f4ae805' 
  AND token = 'rXtUmFSrzc/DdrmeGEVipi+nyAatydo8x5TEtpl9hsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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