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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f2ace3b14db2150ad5d097a8380a003947f7f13fd06237ea99a27ff320dfd0' 
  AND token = '0bcepT8ZvJt6fhPE0TP9JyoeAevHFRMsg9Q9wc6n0P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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