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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '762776389dc0bba5f3e5d988f46ddee9984cb9c0252196585dee15f02576202e' 
  AND token = 'JMt0FT3qndxqLbIVa8HJeQtgaTPBEuWdWS8/8dMyK3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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