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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942eea6770069c1d968051019e957cf264dbea5ed4bd176d6818e331bdb2708c' 
  AND token = '3dzryxkZI5Ly3zf4DzYOfGs2Bg0E6eQiImYUb8QLb78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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