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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f206294868e9d7331a6363cb2724f61b9201c54c9bec88aefb8d470cdbddfa5' 
  AND token = 'DsBPwch7NptLxCKOdkZWrghq42OkMzbSLNP/s4OcPHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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