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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c919b64c85fc1f3f30100a2f056fd6000a563535fcc932f6e8a320e9a88e77' 
  AND token = 'vUlDOjiSJDQm8w6OlDJVoL7/a74mJ/J56vH//YFUXWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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