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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011c3aecee2e57a81f428a2f756668ab09703b43c8691ee1a78d79c6db0da5ea' 
  AND token = 'eGtCH9cwMXc9YA5brn+uaQOzZ57DR/l207r7y8WMQSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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