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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '152c15d7652e8013f7b2b24f56a1bcc00a7c73bea4413bce21dc48fadf6dfab6' 
  AND token = 'EOB9sf5p2H7IyITfIbVHwWokjfP+12PsKhbZJpgieQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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