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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be870dc46a1de7e5d645e5e28c351449797bc5aa97d9c5c70265a6c8c26c09b0' 
  AND token = 'eyLjocI/7TKf3gqULBdKKWBdZLS5eo6EwT3ldA+HUdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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