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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97d6b2c910d7a8caa5f5acc57687043e2613f07aac45eb9797911a2162a1557' 
  AND token = 'TCjK1GO3PIp8bazCSCwSew7J3/I9WDvJ2aTsc5/SkDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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