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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcecba020821827ed497c8aac67b7b6edc37a51989e7778b7414f49f0739bed' 
  AND token = 'WOipY5xyJ98cWVFvPhm3dvjvcyx8VB1FbDqTz7iWGTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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