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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264fd07d68e82f373ae5dce81792bf20b44655dbf0a19a0411e24960e9a490fc' 
  AND token = 'PbdVPd+0D+UtNrjhua/QoSH760UU3j0My/H9RLaJ5lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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