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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813b4ad2e61f56c86ad8c258b7ae3e331ef060f0e9dc508abdc62319c9d642d6' 
  AND token = 'gvk6Wizgk8FDOw4FHP99nNo1UpADYuogkJ+TP2tdfGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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