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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f694927dd016b1336caf401d9825b073f4d9d770f9f33ef59d6d4113a2c750' 
  AND token = 'kOSudKAJckRmrDwZemwdUFfpWPAR0thL1K/lEUA9cYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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