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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fcb19179747278296c4c6d5e75f79e009e0647490602a76c8e76c89515cf4fb' 
  AND token = 'Cn1Zc5+XYusCoHe2FsV5iPlNymE5v6tfgMOhgn77gv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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