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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6914abe625af0a2a916fe863c8ce1a65d4427ac6f151b72b7e3aa871afba911d' 
  AND token = '9clmeTXhFhbEAn/dE6LERMN8OnZEdgaUH/J085aYbdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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