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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f139065cd4a196ff450afccd273bc6f38d948dd9c87991c2b7af0aae0629a3f' 
  AND token = 'QYn/+yO7q2b7GSzM9O3oB33bwaI3Q1GktojvX2EGtaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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