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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c37b1811934145677b776be69cbeb08c1cd64c7493ae3b02a3bc484ddf75b8' 
  AND token = 'q32EvT+K0GwDaMWG37F7X/A77rKquIjnnUqzZ9rW4Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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