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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd620bbc325db7c09862b5e3621020ffe586cdbbd179f7a9e64d89663dd3f6631' 
  AND token = 'Xcrxv4vKTmgWH2x5cPv8BwelXgjcmm9zo1uCtsCCUYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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