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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7db9bb02745387e86b09b5bde370b569c79d0eba766eb1f72d1a3ab434bf5cd' 
  AND token = 'ztgZF+hzgdj9zvMnK6T2E9qvappQHDjSH4y3RefVJTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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