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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ab8bba89eb13810ed827e9c39fabdd0b8b83d1ffb5854f78358d37d363d088' 
  AND token = 'alRrRf5WFkyCaCHj/bmFK28YLg0rVen6yDRqXqlBWcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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