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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09cb1150c8ee6bd920bebe0626349eb0c1ff31169086d358756191256f5109a6' 
  AND token = '/rqpW9N0bLRab0ehYz+sBOeoeb8hQe5AnFT3cd7Hgfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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