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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31aba175d836694e5daf646e4cef3e59c2f2ea23e691d249c00564e697c539f' 
  AND token = 'xlTtZNTrmT67lOntCm9LiCYplrP05gkrP9mH7Dhesm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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