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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff97ab04c99cd35c4191a43382c0c0cbb8cb1c7016fcfe5487c03cc40a93e35d' 
  AND token = 'M7VnQIXzuIMNQLLulIIFghgOQ7vJs/AL+cijGyBg2GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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