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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1688d45ebcc1dd90e2d89d17682bf4d37b46854d0c7b1ed178a71af1b7183f' 
  AND token = '3eEYfBzJ6BnNsDTyaOn8y3g090cC8eVuVgogI0SNs4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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