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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dfaaf6a1cb63e2d9f57e0df1971b7386c3c4db28faba12dc19719e5e256eb84' 
  AND token = 'Z5bZbv/AC4LpTY5yXmCNovO8EWdCMsC3mJrH7L55daI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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