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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a25074b07ffed290c1a8af270ee53c1a62aceb7e3ec9ccc6fa68d68ef11d1c' 
  AND token = 'A5N0+TRsEdmEVPnb4992CYjzNY78ENhpI5aUs281uVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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