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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7805451a0577aaef2738dcd2a51813a58efeb0bbc2d81a7d98309d9337f1dda' 
  AND token = 'LROl+ZkvGylbK83bKJq04WI/yc/bequoe7869lTDeRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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