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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20da0e6310b9eaff57318d1ac736b2435181f06e3c75d5f56ff0ebea214e2d3' 
  AND token = 'NBbB8ukGRBfejEAhjCGCJZ0MVZiObRkOYs0te69YtMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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