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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3570312411ba43339b6579656b0d1a7e746175c6f7f1c6ef06d16e66c1f9c15' 
  AND token = 'a2qUdM8abQJp0mBmXmmwMMJNnAiZJ8w7AsDlritOx1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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