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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8efdc45c911aaa2c4a7c22315890575c90f4f682c3aa71fd510faa1cd7ec9c6' 
  AND token = 'zXTAc3JH9IZnqvOmNnDbqNbQ9dWzDuSzDSPfBy4CcLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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