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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6bc5ef1c0fa5c32f1ea6158bd8f6b6497fa1a20675f9dc5695a5607ddfcf0a' 
  AND token = 'nBnJxYQHAiA7ZBRcs4Rc7AkBvAA2rvtgHmSgAqQLDQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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