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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7599bc1b96353119ce540c5a926f7f441a872a1e6e5d09818b00610258431b' 
  AND token = '7EFCkPGc2L8r1H8u3N12KhIjsThugdMXT+kvNIavZfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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