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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85290cb9e76fa740e429a263cf19eaba45f46cc27d7d5d76145768f02b6a5688' 
  AND token = 'C0y2nr159HQ8b7yhOWxrHgFnv9HgMsxZHI+1y7J/vrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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