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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91290839fb9cea3368b3c6da46fb8a1a0ebc5bc9fbc2983c39b5e7e2003da6e8' 
  AND token = 'f83vU3H+TsKS9r669KDkvvFP7F95QKXX0rdlrMKRYrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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