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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df309bea3a6125325baa78ce13c56fb4cc13fec5921c48c7be5ca291d908faff' 
  AND token = 'X9tmwkcw3NPcc5mud8aheCMWmfY6Pun2rSlwQLqlZyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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