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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912998ec5d18cc973d5daf21173c7e8f6221c904a3cbf2f8bfdfae360b33a5b6' 
  AND token = 'HCz+9Z8pqQ1+edKQIupo7Q+bETha67CVTgwiboNpmR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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