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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5fb27126332239c1680aa3083c79ac6a285d842c89eefd703213bfaab5d4ed9' 
  AND token = 'BS8dCgPXRj6TFdDyxu7OUgOb7/Rd6L1oEi9BC+OtU7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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