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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb83885d0b52e69422d2e9d46d56cd99ef3c52f8e194e57d84a9aea54e94e26' 
  AND token = 'Y2XGzbKtvLMdEBXuJvt/FAZamGW4iOj9GeTQ7LrwHSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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