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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cbd5880642662c64ddda7be478e8f7cbd5c6dece791607a50abef10698d7d79' 
  AND token = 'yij6v62hrhtYxZSSAJT4P30at7sTyZ9o7DSQULFjvV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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