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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff980f277dadbf40ade8788c8ebae1066c2a05367ca5ffedcd2bd94b87e1b6ed' 
  AND token = '0Mn/8DkabyCewr66+Y/TuN34zovIJ4aTSqpps9msKtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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