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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f690fd6260cf31c3382871294e5339476a4693a6e502982b94f85d6ae828008' 
  AND token = 'WA2+smrsZm6gqkHY5fDSleCLdWXHMx0vbmG50aNNq4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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