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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d32e271c5f9c587325108779cf6e2f4f72a42379d359bcf18de3f13a534386' 
  AND token = 'jrnj/yPeyr1WLQosAHzJ4aNM06YaC8YxmasNwKfuFQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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