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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7fa5f0c631c3f1a09ebc61f7f1f899f4910757f512cb36b0036c402e22f17e' 
  AND token = 'sR5IJdjMCd7DwHOYhCRsrFDBqaqFvVaSneF5seCwDV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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