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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1db9fad0c5cdf1bf605ba9eb9875ce680738e5126c0bef6315e1445b9c4a93a' 
  AND token = 'BG7FWfRvdQ6Ab0lJycGe3VeBUocNZddRU1z0eNI994I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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