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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b221803ecb7d7fa4bdae1ba861d0a1871a2869a18995989c57fcea4ae3284f7f' 
  AND token = 'VzonwVEiKmTgnriAcGGb5CINsKi+73Z/ENPaCbTCho8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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