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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b920dd30ff4ee268122b56b62aa4a7e4d0574f2ebd8d891da56fa50f2e7a99' 
  AND token = 'pV1kb2itVXsGvDN0YARcn9jlyVRa5qFlR/FgSGJm6CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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