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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502ea8afdf08c7374016a21cc5975dfc1f153b7440e441be6ed2d634a21ce28a' 
  AND token = '75spbyxVdOp1BMDxXDdBHEewC7N08dzQ5KUTntIwCBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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