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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f16d0c2fe5f7933387eaac96aced957873d3b298b987082742e0e3713d9ef852' 
  AND token = 'njPsfctupWniv5p2Emy2n4KTFocuO+OtINJblqRTY1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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