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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f603918b876402c5c9c7e426db1b5a06233c78957be126a9b474afe549c412a' 
  AND token = 'vyzmsJu9QtW4zTUSciXdWrB/Oh7ctI2qIGse4T+2EiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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