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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9966cff64a1f98058267034dae2a99f088e92c41d8de739be25e0752a77151' 
  AND token = 'nDpKdcRom+oa2G0ci1Udj9o99QMvlqazxq1ypapqor4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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