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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae02ea272880baac90ea2a84284bce22aa0af8910e88a6a8f48e7e5e0cd75ef' 
  AND token = 'bljwOpdfRBBdDPEiYeyj0qS8msREn2iFNXeg+Utzdt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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