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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55319c7ea9b22994e59dd923abb27d556b41a6b3a021fa0825a1ce19133a8eed' 
  AND token = 'OHqIDfTv9TtuyHmJYcaMfPiOpksvH/vLnieD28IbR9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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