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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1155ed45a6da0bdde53bbdb2f926025848301369cec553fa0a489f9d118274' 
  AND token = 'hoZVRnZAxazZlGwnUbVoaFBiK1Y9NzszdnXfWWu0sRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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