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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65bd1aa442f4b7b95c5d3aada84132a68c68c48d606a852a657048696d5401dc' 
  AND token = 'QbWZthauN6EuB5QJ5o+IA6E7FsjPMc9qbCsJk0epA7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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