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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fac4bd88c82a18dbc4c8a1115483b7a202c97b011bcf59608c8ecbefdaccc73' 
  AND token = '+dbvTXxY94j5FDmJdq3kVE94Sit73ZA7gqwMBfuz6AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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