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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb827b46757303ec04b11a25bb3a99cc4cede2f0d2dc2b495cf1fb9f1ceaac35' 
  AND token = 'cEG8aL5X7Duk/gCJ5gMuLTzqgH4AYUpWTDGtjqu3DaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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