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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a95604ebdf387faffc2426529f3bb1507bab2ce1e9ba629234d442f93d72b5' 
  AND token = 'FrUX2fTgZaMtuNlcHeHW93qc2eR9FzFA9BKKwC4HyoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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