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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a32e8fc8077c40e549f7e97f51a27f14be5527cfd2a4aeca656d1c036849ecf' 
  AND token = 'YZ533rAmeMkHpKDDA2OGlnDaIdvCc2ZU8LnOKli+N0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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