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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a9b074f92c4088aa4fdd48a1c34ab0c38c57d008f40c4e53be39342395b71e' 
  AND token = 'JvGnnU94NKro3PzSlLYdfLa7DV8i3kYcd7IxbILeAYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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