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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f3512d4ee12663bd4c3b40d2825bd2c26253152bc4bba902e7635d3543ade7' 
  AND token = '0O5Tticfwxpia2NXHM1jRWumHeliMkwhfjWVUmHFGi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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