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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32add4e0a40817a241ed88479beb8bc37c64f008aca8cd0640e36b98d03e7af2' 
  AND token = '+k8+D9/rX9B0yw7h24KyD02JKREtkkE7pJThcBcsLyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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