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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd38f78d69521a6bdd20cf1a850e8593e0728fd2efee0c8c2e0d75e4a9cc844' 
  AND token = 'vHZbHAZ9iJVClJZH5/sqLJjQqqj8rBKZdQmoKOObdi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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