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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5197cf779c26b1dc1edc3a45c303d392a945b2533f9a1392ee2253683143a2' 
  AND token = '2Sg6/eqZmtgJUzwcsrXmRjU/Y8QEBIz3a6J7gDUXHjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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