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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9308a08f376566ce803bcd1985a7f2489224927e552d7dda465c37c25d306a6d' 
  AND token = '7ILbXAMx2rDU+5AKnSzu4l4dEuiock+QDKw/ALXdwPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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