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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2a21b0f8852fc5e990d726ab417a35b08b7c4ce45fc8d58e71d70496dfa478' 
  AND token = 'yFfWKLDpWNWDva7p1Ig3jNECQMTrqnh4r5w6FP+vTA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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