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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95fd0baf1a2ee90e229b8205a952a4d72e746e789a8a84996e5ab445f262368' 
  AND token = 'al6pHUDQROvm/F39NmWnqRgzGixIiNBCN0zK2tSiNA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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