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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd746da8114634cd295a90b02f29c20c3d9835789997dba82f470bf1b5361e28' 
  AND token = 'LxQIk+4HAbllscUQG9y+kVjGkJY2Qn0UFDdOPci/elY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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